sweet potato

Three Africans ponder the tuber. "There is simply no bad way to prepare sweet potatoes," writes a Zimbabwean. They fueled a Ugandan for his 8-mile run to school. But for one Kenyan they're a big yuck.

It's one of many varieties in Madagascar that are being studied as part of a project to bring better nutrition to people. And no, it's not the same as a sweet potato.

The orange root vegetable is not just a base for melted marshmallows.